TM 9-4120-403-14
Figure 5-8. Evacuating the Refrigerant System.
b Check that new dehydrator was installed. If not, install one.
c Check that both service valves and charging manifold valves are closed.
d Attach hose assemblies to service valves and charging manifold valves.
e Attach hose assembly to vacuum pump.
f Start vacuum pump.
g Open charging manifold valves.
h Open both unit service valves.
i Run the vacuum pump until at least 29 inches of mercury, measured on the gage, is reached.
NOTE
Inability to reach 29 inches of mercury may indicate either a leak or a problem with the pump.
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